package com.cjh.web;

import com.cjh.pojo.Book;
import com.cjh.pojo.Page;
import com.cjh.service.BookService;
import com.cjh.service.impl.BookServiceImpl;
import com.cjh.utils.WebUtils;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @Author: huahua
 * @Date: 2020-09-10 9:55
 */
public class ClientBookServlet extends BaseServlet {

    private BookService bookService = new BookServiceImpl();

    /**
     * 主页的分页
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void page(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1 获取请求的参数 pageNo 和 pageSize
        int pageNo = WebUtils.parseInt(req.getParameter("pageNo"), 1);
        int pageSize = WebUtils.parseInt(req.getParameter("pageSize"), Page.PAGE_SIZE);
        //2 调用BookService.page(pageNo，pageSize)：Page对象
        Page<Book> page = bookService.page(pageNo, pageSize);


        page.setUrl("client/bookServlet?action=page");

        //3 保存Page对象到Request域中
        req.setAttribute("page", page);
        //4 请求转发到pages/manager/book_manager.jsp页面
        req.getRequestDispatcher("/pages/client/index.jsp").forward(req, resp);
    }

    protected void pageByPrice(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1 获取请求的参数 pageNo 和 pageSize
        int pageNo = WebUtils.parseInt(req.getParameter("pageNo"), 1);
        int pageSize = WebUtils.parseInt(req.getParameter("pageSize"), Page.PAGE_SIZE);
        int min = WebUtils.parseInt(req.getParameter("min"),0);
        int max = WebUtils.parseInt(req.getParameter("max"),Integer.MAX_VALUE);

        //2 调用BookService.page(pageNo，pageSize)：Page对象
        Page<Book> page = bookService.pageByPrice(pageNo, pageSize,min,max);

        StringBuilder sb = new StringBuilder("client/bookServlet?action=pageByPrice");
        //如果有最小价格参数，追加到分页条的的地址参数中
        if (req.getParameter("min")!=null){
            sb.append("&min=").append(req.getParameter("min"));
        }
        //如果有最大价格参数，追加到分页条的的地址参数中
        if (req.getParameter("max")!=null){
            sb.append("&max=").append(req.getParameter("max"));
        }

        page.setUrl(sb.toString());

        //3 保存Page对象到Request域中
        req.setAttribute("page", page);
        //4 请求转发到pages/manager/book_manager.jsp页面
        req.getRequestDispatcher("/pages/client/index.jsp").forward(req, resp);
    }
}
